For SLR cameras I feel the OM Zuikos are very good. But I don't believe they can match the best rangefinder wides. Even the lower priced CV seem better than the 30 year old Zuikos.
I'm sure the Pentax, Nikon, Canon and Minolta SLR lenses are as good as the Olympus.
I have OM but not rangefinder and I have always wanted rangefinders for their lenses but was never willing to pay for them.